Tool.



A. L. LUCAS.

TOOL.

APPLICATION FILED MAR. 8, ms.

Patented Nov. 16, 1915.

2 SHEETSSHEET llllllllllllllll llllllllllll @Illllllllll'lll lll lll lll'lll ll'll i. (B: i L r wirbnamo W COLUMBIA PLANOGRAPH cm. WASHINGTON. nc.

A. L. LUCAS.

TOOL.

APPLICATION FILED MAR. 8. 1915.

Patented Nov. 16, 1915.

2 SHEETSSHEET 2- COLUMBIA PLANDGRAPH 60., WASHINGTON, D. c.

ran s Ayrn AUGUST L. Lucas. or New HAVEN, CONNECTICUT.

TOOL.

Specification of Letters Patent.

i Patented Nov. in, 1915.

Application filed March 8, 1915. Serial No; 12,950.

tain new and useful Improvements in Tools, 1

of which the following is a specification, reference being had thereinto the accompanying drawings.

My invention relates to a new and improved tool of the type generallyknown as a combined protractor and square.

It is the object of my invention, among other things, to produce a toolof this charactor that can be utilized in determining any level orangle, as well as to determine straight edges, describe circles, etc.

To these, and other ends, my invention consists in the tool, havingcertain details of construction and combinations of parts, as will behereinafter described and -more particularly pointed out in the claims.

Referring to the drawings, in which like numerals of reference designatelike parts in the several figures; Figures 1 to 5, inclusive, illustratein plan views the device with varying positions of the arms in relationto the head member; Fig. 6 is a sectional view of the parts, taken uponline A-B of Fig. 2; Fig. 7 is also a sectional view of the parts, takenupon line CD of Fig. 3; Fig. 8 is an enlarged fragmentary rear view ofthe arms, showing the method of locking the reciprocating plate; Fig. 9is a side view of the clamp plate; and Fig. 10 is a perspective view ofthe key. I

In the embodiment of my invention 1 provide a head member 1, having astraight edge 2 upon one side thereof, with openings 33 therethrough,within the. edges of which are the levels 1, 5', 6 and 7. Upon one sideof the head are the stop lugs 8.

The numeral'9 designates the long arm which is provided with a slot 10therein and pivotally secured to the head 1 by the screw 11. A pointer12 at the end adjacent to the screw 11 moves in the path of the headgraduations 13 concentric with the axis of said screw. This arm issecured in any of its adjusted positions by a bolt 141 which passesthrough a circular slot 15 in the head member with a head 16 thereonwithin a recess 21, and a thumb nut 17 upon the other end of the boltcontacting with the washer 18. By loosening the nut 17, the

the screw 11 and is secured in any of its intermediate positions byagain tightening the nut. The stop lugs 8 limit the movement of the longarm 9 at the opposite ends of a 180 movement.

Secured to one side of head 1.is a plate 19 having a pocket 20 thereinwhich covers the nut 22 upon the bolt 11, the recess 21 and bolt head16, as-well as providing a pocket within which the key 23 is kept whennot in use.

The numeral 24 designates the short arm which is provided with a slot 25and an opening 26 in one end thereof, for a purpose hereafter to bedescribed. Both the long and short arms are graduatedon both edges andare pivotally and rigidly secured to each other by means of the clampplate 27, which travels within the recess 28 in the back of the arm 9,the clamp plate 29, which travels in the recess 30 in the back of theshort arm 24, the clamp plate 31 which bears against the face of theshort arm 24:, the bolt 32, which passes through all of said plates andhaving a nut 33 upon the outer end thereof withthe washer 34 under said'23, which when it lies therein abuts against one edge-of the recess 28at one end and projects into any one of the notches 37 at the oppositeend.

By tightening the thumb nut 38 the short arm 24 issecuredeagainstendwise movement in relation to the clamp plate 31, andby tightening the thumb nut '33 the arms are rigidly secured togetheragainst movement in any direction.

If it is desired to rotate the short arm 24 so as to describe a circle,the key 23 is inserted in the clamp plate 27 and engages one of thenotches 37. which prevents endwise movement of said clamp plate inrelation to the long arm 9, and the short arm 24 is secured to the clampplate 31 through the tightening of the thumb nut 38, after which apencil point is passed through the opening 26 in the end thereof. Theshort arm can now be moved in a circular path without relative endwisemovement upon the long arm 9.

arm 9 is free to be moved about the axis of Separably ecured by anyconvenient means to the short arm 24% is a "to the" head member.

range, circlesmay be drawnat any point level 40' that determines thehorizontal" or vertical position of the said's'hortarm' when" the sameis at a point distant from thehead, 1. With this device any angle orcombinaf 7 tion of angles may be obtained in relation Within a limitedor at any angle, the edges of both arms may be used as a straightedge,-the location of the levels is such that the parts may always bearranged in true horizontal or vertical positions, and invarious otherWays, too obvious to mentlon, the device'has a substantially unlimitedscope and-range- Wherever slotted arm pivotally connected therewith;

a second arm slidably and separably' secured to 1 said' first arm aclamp plate, having a slidable and non-rotatable connection With one of'saidj arms; a plate; having a slidable connection= with the" other of}said arms and: an adjustable connection between saidplates. i

2. In a deviceof the character described, the combination with a headmember, havingleyels connectedtherewith; of a slotted arm pivotally'connectedjwith" said head member; means for securin said arm to saidhead member'inany o- 'it'sinte'rmediate positions; meansconnected With"said head for limiting the movement of said arm; a second slotted arni,having a c'onnectionwith said slotted arm'; meansfor rigidly andpivotally securing said arms-to:

gether I said means comprising a clamp plate connected with one of aidarms; a second clamp plate connected With the other of said armsthreaded means for securing said latter platetothearm' with which it isconnected; and threaded means for securing all of said plates and armstogether. z,

In a device of the character described, the combination with a headmember; of a slottedarmpriovided ith recesses pivotally connectedWithsaid head member; means for securing said arm toisaid head member in anyof its intermediate pos tions; means connected with said head forlimitlng the movement of saidarmg a=second slotted arm,

the combination with a head member; of a slotted arm pivotally connectedWith said head member-,having a recess in one face thereof and aplurality of notches in the edge of said recesses;1 means for pivotallysecuring said: arm to said head member; means-for securing said armagainst movement in any'of-its intermediate positions; a second slottedarm, havingconnection with said slotted arm; a clampplate connected witheach eta-1a arms; a key s'epiar'ab'ly mounted within one of said clampplates and projecting into any one'ofsaid-notehes; aibolt 'arith a nut'thereon passing through both of said clam-p plates and'arins-for thepurpose ofas ecuring said members together.

In testimony whereof I ifix my signature inpresence of two-witnessesii fV AUGUST- L.-LUGAS.-

ZGEORGE EA HALL, I FLORENGE M NKQ copiesaof s pate as be e ai efd o c ce-ea h ha addrss inaths; iGQQ m maa at n i Wa hin n-1,3. Q2

